Forging and upsetting machines with improved clamping jaws



Aug- 13, 1963 H. ESSER ET AL 3,100,409

FORGING AND UPSETTING MACHINES WITH IMPROVED CLAMPING JAWS Filed Aug. 10, 1961 2 ShzetS-Sheell 1 A /NVENTRS H. Eager 4- L/'trotmann rg ww ATTy- Aug. 13, 1963 H. Essl-:R ET AL 3,100,409

FORGING AND UPSETTING MACHINES WITH IMPROVED CLAMPING JAWS Filed Aug. lO, 1961 2 Sheets-Sheet 2 l l l l I v u llllllll'l--UlllI m..

BY C United States Patent O 3,100,409 Y FORGENG AND UPSETTING MACHENES WITH llViPRGVED .CLAli/BING JAWS Heinrich Esser and Werner Stratmann, both of Leverku-A sen, Germany, assiguors to Eumudo Aktiengesellschaft fr Maschinenbau, Leverkusen, Germany, a firm Filed Ang. 10, 1961, Ser. No. 130,540 Claims priority, application Germany Aug. 12, 1960y 7 Claims.V (Cl. 78-17) setting force has to be taken up via the divided dies by the machine parts in which the dies are mounted. To prevent shifting of the workpieces, the machine parts in which the tixed and movable dies are mounted must have the same elongation, that is to say, the same stiffness.

In forging and upsetting machines with clamping jaws,

therefore, the jaw-yoke in which the movable die is mounted must have the same stiffness as the machine bed in which the fixed die is situated. This requirement necessitates a heavy jaw-yoke construction, especially since the jaw-yoke is of considerable length, being pivotally mounted at the rear end :of the machine.

It is the object of the invention to provide an improved forging and upsetting machine of the kind mentioned having means for reliably eliminating the danger of shifting of workpieces during upsetting. The machine is characterized invthat in `order to shorten the jaw-yoke length subjected to elongation in the upsetting direction, the jawyoke is provided with locking means operative in the upsetting direction and interengaging with the machine bed. This results in a shortening of the jaw-yoke length subjected to elongation with the machine bed in the closed condition of :the dies. For the same stiness, the possibility of elongation of the jaw-yoke is substantially reduced as compared with existing jaw-yokes, thereby assisting substantially in preventing shifting of the workpiece.

Advantageously, the jaw-yoke is provided on the underside with a projection which, in the closed die position, is adapted to bear rmly against a stop on the machine bed. The locking elements should -be situated as close as possible to the tools in order to keep as small as possible the jaw-yoke length subjected to elongation. On the other hand, the locking elements must be situated so far to the rear as not to hinder yaccessibility of the tools and hence automatic workpiece transport through the tools.

The abutment faces are `advantageously plane surfaces. They may, however, be made arcuate in certain cases, for example, with a curvature corresponding to the radius to the pivoting point of the jaw-yoke.

An example embodiment of the invention is illustrated in the yaccompanying drawings wherein like parts are referred to by like reference numerals.

FIG. 1 is a schematic yside elevation view and shows ,the forging and upsetting machine with .the clamping jaws;

FIG. 2 corresponds to FIG. 1 and in addition shows the driving means for the upsetting ram and jaw-yoke;

FIG. 3 is a longitudinal section on the line IlI-III in FIG. 2 with the jaw-yoke removed and with a plane of the upsetting ram;

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FIG. 4 is an end view of the forging and upsetting machine of FIG. 2 in the direction of the arrow 1V; and

FIG. 5 is a fragmentary side view showing a modified form of stop.

Referring now to the drawings in detail, it will be seen that the machine includes a machine bed 1 carrying -a jaw-yoke 2 which is pivotally mounted on a spindle 3 carried by the machine bed 1. The pivoting movement of the jaw-yoke 2 is effected by means of connecting rods 4 anda multi-link mechanism hereinafter described. Connected to the jaw-yoke 2 is a top die 5, while a bottom die 6 is iixed to the machine bed 1. Upsetting punches 7 are mounted in the upsetting ram 8 which is horizontally movable.

Power from a driving motor 9, which is mounted on a bracket y10 at the rear of the machine bed 1, is ltransmitted by means of a V-belt 11 to flywheel 12 mounted on a countershaft 13. Movement is transmitted from the countershaft 13 by a gearwheel 14 to a large gearwheel 15, which is mounted on a crankshaft 16 and in which is incorporated a clutch 17. On a crankpin 16a of the crankshaft =16 is mounted a push rod 18, pivoted by pin '19 to the upsetting ram 8. The upsetting ram 8 has the form of a yoke and is guided in the machine bed 1 at 20 and 21 in front of land behind the crankshaft mounting. This provides a considerable guiding length for the upsetting ram 8.

Driven directly from the push rod 18 is a multiple lever mechanism, which produces the clamping movement of the jaw-yoke 2' by means of the connecting rods 4. This multiple lever mechanism consists of links 22 pivoted to the push rod 18 at 23 and to la bell-crank 24 at 25. The bell-crank 24 is rotatable in the machine bed 1 at 26. Movement is transmitted from the bell-crank 24 by means of a push rod '27 to a toggle lever 28 pivoted in the front part of the machine bed 1 at 29. The connecting rods 4, situated ion either side :of the machine, engage this toggle lever 28, while their upper ends are pivoted by a pin 30 to the jaw-yoke 2. The connection between the toggle 28 and the connect-ing rods 4 is produced by means of a pin 31. The crank-shaft 16 also carries the friction brake 32.

When the machine is running idle, the parts 9 to 15 rotate continuously in a uniform manner. For operating the machine, the llarge gearwheel 15 is connected to the crankshaft 16 by means of the clutch 17, whereby the upsetting ram 8 is reciprocated by the push rod 18. The movement of the push rod 18 produces at the same time the opening `and closing of the jaw-yoke 2 by means of the connecting rods 4 and the multiple lever mechanism 22 to 3'1. By means of this mechanism arrangement, closing of the dies 5 and `6 relatively to each other by means of the jaw-yoke 2 occurs at about 90 crank angle, remains closed for the next 180, during which the upsetting process takes place by means of the upsetting ram 8 and the upsetting punches 7, and the dies S and 6 are opened by the upward movement of the jaw-yoke 2 only on the last crank angle.

To still more reliably eliminate shifting of the clamping dies 5, 6 at the workpiece, without having to redesign the jaw-yoke, the jaw-yoke 2 in the closed position is 'locked with the machine bed `1 between the ends. For this purpose, the jaw-yoke 2 is provided with a projection -33 which, in the closed position of the dies, is adapted to bear iirmly against -a stop 34 in the machine bed 1. It the parts 33 and 34 were non-existent, the elongation of the jaw-yoke 2 between the pivot 3 and the movable die 5 must be equal to the elongation of the machine bed 1 between the pivot 3 and the xfed die 6. If, on the contrary, the interlocking parts 33 and 34 are provided, the elongation of the jaw-yoke only on the length bedecisive facto; in 'the elongation;

tween the projection 33 and thermovableidie S has to be VV i equal to the elongation of the machine bed between stop 34 and fixed die 6. This means that the machine pants behind the parts 33 and 34canlrbe made lighter in construction, since these parts in practice are'y no longer a `Mutuall'y abutting surfaces 33a and 34a-of the parts Y33 and 34,1nay be plane in construction.A These surfaces may also have a curved form 35 lwith a radius about the 'pivoting point of the pin 3 of the jaw-yoke 2K. as indicated .in FIG. 5.y

. From the foregoing, it will be seen that there has been v devised suitable meansforaccompl-ishing thedesired end` VVthe underside of said jaw-yoke and a cooperating stop on said machine bed disposed in -rm abutting, relation in the closed position of said jaw-yoke.

`3. The forging and upsetting machine of claim 2 where- :in said 'locking means is rendered effective for a period of time corresponding no the upsetting stnoke of said upsetting punch.

4. TheV forging and upsetting machine of claim 2 wherein said projection and said stop have planar abutting Although a preferred embodiment of the invention has been disclosed, it is to be understood thatminor variations may bermade therein Without departing from the spiritV and scope ofthe invention asv claimed.

What is claimed as new is: v Y

1. Al forging and upsetting machinefcomprising a maf chine bed, a jaw-yoke having pivot means pivotally con'- necting the same to said machine bed; divided clamping dies carried `by said machine bed and said jaw-yoke; an upsetting punch positioned between said jawfyoke *andl said machine-bed for cooperation with vsaid clamping dies; drive means connected to said upsetting punch and. saidV jaw-yoke for reciprocating said upsetting punchY and opening and closing said clamping dies inf timed relation, and means `for locking said jaw-yoke to said machine bed intermediate said clamping dies and said jaw-yoke pivot means yagainst movement in thedirection of movement of said upsetting punch to thereby shorten the length of said jaw-yoke subject to elongation by the force exerted surfaces. v Y A v '5. The forging and upsetting machine of claim 2 Whereinsaid projection and Said Vstop have arcuate abutting surfaces. Y

6.` The forging land upsetting machine of claim 2 i wherein said projection land said stop have arcuate abut- References Cited in thele of this patent UNITED STATES PATENTS 2,632,135 Riemenschneider June 2.9, '1954 FOREIGN PATENTS 4,312 GreatBri-tain Feb. 2s, 1901 948,381

Germany 'V Aug. 9, 1956 

1. A FORGING AND UPSETTING MACHINE COMPRISING A MACHINE BED, A JAW-YOKE HAVING PIVOT MEANS PIVOTALLY CONNECTING THE SAME TO SAID MACHINE BED, DIVIDED CLAMPING DIES CARRIED BY SAID MACHINE BED AND SAID JAW-YOKE, AN UPSETTING PUNCH POSITIONED BETWEEN SAID JAW-YOKE AND SAID MACHINE BED FOR COOPERATION WITH SAID CLAMPING DIES, DRIVE MEANS CONNECTED TO SAID UPSETTING PUNCH AND SAID JAW-YOKE FOR RECIPROCATING SAID UPSETTING PUNCH AND OPENING AND CLOSING SAID CLAMPING DIES IN TIMED RELATION, AND MEANS FOR LOCKING SAID JAW-YOKE TO SAID MACHINE BED INTERMEDIATE SAID CLAMPING DIES AND SAID JAW-YOKE PIVOT MEANS AGAINST MOVEMENT IN THE DIRECTION OF MOVEMENT OF SAID UPSETTING PUNCH TO THEREBY SHORTEN THE LENGTH OF SAID JAW-YOKE SUBJECT TO ELONGATION BY THE FORCE EXERTED THEREON THROUGH THE ASSOCIATED ONE OF SAID CLAMPING DIES DURING THE OPERATION OF SAID UPSETTING PUNCH. 